Hey all I have a 99 cherokee with a 4l in it and it's running rough like vibration when at any rpm above idle I've replaced the plugs wires cap and rotor and still no better cel is on but it's for the o2 that's no longer in there any help is great fully welcomed

 

Put it back. They run like crap without them.

 

ok new o2 it is

 

X2. It's there for a reason and not just for emissions.

 

Fixed. Guys on here don't like that. Plus its against the law

 

ok guess i know what im doing today thanks all for the help

 

Just an update for you guys ive replaced the missing o2s and still no better anyone got any more ideas?

 

I assume the code for the O2 is gone now? What other codes are stored?
A vacuum gauge can tell you a lot, not only about vacuum system integrity but valve issues, restricted exhaust.....cylinder compression might be a good thing to check also.

 

The code has not cleared yet but it is running better now i just have to figure out and fix the fact that the front end wanders and and get some swaybar end links and replace the front axle ujoints